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我无法升级系统，现在该怎么办？

tag-icon • tag-icon upgrade updates update-manager
我无法升级系统，现在该怎么办？

当我更新时，下载一些文件后显示以下错误。我现在该怎么办？

W:Failed to fetch cdrom://Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805)/dists/trusty/main/binary-amd64/Packages  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
, W:Failed to fetch cdrom://Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805)/dists/trusty/restricted/binary-amd64/Packages  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
, W:Failed to fetch cdrom://Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805)/dists/trusty/main/binary-i386/Packages  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
, W:Failed to fetch cdrom://Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805)/dists/trusty/restricted/binary-i386/Packages  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
, E:Some index files failed to download. They have been ignored, or old ones used instead.

答案1

从 USB 启动时会出现这种情况，只要您连接到互联网，就可以安全地忽略这些行，因为可以从互联网上下载软件包。通常，您可以直接从 LiveCD 安装少量软件包，例如 WiFi 驱动程序，但不幸的是，此功能不适用于 LiveUSB。

如果需要，可以使用dpkgUSB 驱动器上“pool”文件夹子文件夹中的 .deb 文件来安装这些软件包（例如，安装该bcmwl-kernel-source软件包以使某些 WiFi 芯片工作）。

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